It goes without saying that ringing the bell for an attendant is common during the travel.
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Most passengers will say“thank you" and give a smile in their farewells to the travel.
A. 对
B. 错
What you choose to wear should depend on when you travel.
A. 对
B. 错
两根不同材料的等截面直杆，承受着相同的拉力，它们的截面面积与长度都相等，问两杆的内力是否相等？
下列属于自主福利的是（ ）。
A. 养老保险
B. 工伤保险
C. 失业保险
D. 商业医疗保险
E. 住房补贴
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